A vehicle lighting unit can prevent the appearance from deteriorating due to darkened portion even when a light guiding member is disposed in an area where the light guiding member cannot be seen from outside. The vehicle lighting unit can include a light source, and a light guiding member having a light guiding main body and configured to receive light emitted from the light source and guide the light while reflecting the light so that the light exits through the light guiding member, which are contained in a lighting chamber defined by a housing and an outer lens covering the opening of the housing. The light guiding member can include a fin-shaped light emitting portion extending from the light guiding main body and disposed in an area corresponding to an angular range through which the light guiding main body of the light guiding member cannot be seen directly from outside.